package com.kuang.servlet.user;

import com.alibaba.fastjson.JSONArray;
import com.kuang.pojo.Role;
import com.kuang.pojo.User;
import com.kuang.service.role.RoleService;
import com.kuang.service.role.RoleServiceImpl;
import com.kuang.service.user.UserService;
import com.kuang.service.user.UserServiceImpl;
import com.kuang.util.Constants;
import com.kuang.util.PageSupport;
import com.mysql.cj.util.StringUtils;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

//实现servlet复用
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if(method.equals("savepwd")&&method!=null){
            this.updatePwd(req,resp);

        }else if (method.equals("pwdmodify")&&method!=null){
            this.pwdModify(req, resp);
        }else if(method.equals("query")&&method!=null){
            this.query(req,resp);

        }

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    //重点 难点
    public void query(HttpServletRequest req, HttpServletResponse resp){
      //查询用户列表
        //从前端获取数据

        String queryUserName = req.getParameter("queryname");
        String queryUserRoletmp = req.getParameter("queryUserRole");
        String pageIndex = req.getParameter("pageIndex");
        int queryUserRole=0;
        //获取用户列表
        UserServiceImpl userService = new UserServiceImpl();
        List<User> userList=null;
        //第一次走这个请求一定是第一页，页面大小固定的
        int pageSize=5;//可以写道配置文件中方便修改
        int currentPageNo=1;

        if(queryUserName==null){
            queryUserName="";
        }
        if(queryUserRoletmp!=null&&!queryUserRoletmp.equals("")){
            queryUserRole=Integer.parseInt(queryUserRoletmp);//给查询赋值
        }
        if(pageIndex!=null){

            try {
                currentPageNo = Integer.parseInt(pageIndex);
            } catch (Exception e) {
                try {
                    resp.sendRedirect("error.jsp");
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
        //获取用户的总数（分页，上一页，下一页）
        int totalCount = userService.getUserCount(queryUserName, queryUserRole);
          //总页数支持
        PageSupport pageSupport=new PageSupport();
        pageSupport.setCurrentPageNo(currentPageNo);
        pageSupport.setPageSize(pageSize);
        pageSupport.setTotalCount(totalCount);

        int totalPageCount = pageSupport.getTotalPageCount();
        //控制尾页和首页
        //如果页面小于1，显示第一页

        if(totalPageCount<1){
            currentPageNo=1;
        }else if(currentPageNo>totalPageCount)
        {
            //当前页面大于最后一页
            currentPageNo=totalPageCount;
        }
        //获取用户列表展示
        userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
        req.setAttribute("userList",userList);

        RoleServiceImpl roleService=new RoleServiceImpl();
        List<Role> roleList = roleService.getRoleList();
        req.setAttribute("roleList",roleList);
        req.setAttribute("totalCount",totalCount);
        req.setAttribute("currentPageNo",currentPageNo);
        req.setAttribute("totalPageCount",totalPageCount);
        req.setAttribute("queryUserName",queryUserName);
        req.setAttribute("queryUserRole",queryUserRole);
        //返回前端
        try {
            req.getRequestDispatcher("userlist.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
    //修改密码
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从session拿id
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        boolean flag=false;
        if(o!=null&&newpassword!=null ){
            //!StringUtils.isNullOrEmpty(newpassword)
            UserService userService =new UserServiceImpl();
            flag= userService.updatePwd(((User) o).getId(), newpassword);
            if(flag){
                req.setAttribute("message","修改密码成功，请退出，使用新密码登录");
                //移除session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }else{
                req.setAttribute("message","修改密码失败");
                //移除session
            }

        }else
        {
            req.setAttribute("message","新密码有问题");
        }
        try {
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //验证旧密码 session有用户密码
    public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
        //从session拿id
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String oldpassword = req.getParameter("oldpassword");

        //万能的Map 结果集
        Map<String, String> resultMap = new HashMap<String,String>();
        if(o==null){
            //session失效 过期了
            resultMap.put("result","sessionerror");


        }else if (StringUtils.isNullOrEmpty(oldpassword)){
            //输入的密码为空
            resultMap.put("result","error");

        }else {
            String userPassword = ((User) o).getUserPassword();//session中用户的密码
            if(oldpassword.equals(userPassword)){
                resultMap.put("result","true");

            }else{
                resultMap.put("result","false");
            }
        }

        try {
            resp.setContentType("application/json");
            PrintWriter writer = resp.getWriter();
            //阿里巴巴的json工具类,转换格式
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
